US3812386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse charge to voltage converter
Assignee: Integrated Photomatrix Ltd
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Filing: 1972-10-11
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Granted: 1974-05-21
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Expires: 1992-10-11
Abstract
Abstract Apparatus for converting a sequence of electrical current pulses into a sequence of steady voltage levels having magnitudes significant of the charge content of the respective pulses includes an integrator for receiving the current pulses, via an input amplifier and one input of an adding network, and operative to perform integration of each pulse over its duration. A first follow and hold circuit is connected to the output of the integrator via a first gate circuit and is operative to follow the integrator output and hold the steady voltage level at the completion of the integration of a pulse. The output of the first follow and hold circuit is connected via a second gate circuit to a second follow and hold circuit for delivering the steady voltage corresponding to each current pulse until another voltage level corresponding to a succeeding current pulse is received from the first follow and hold circuit. The output of the first follow and hold circuit is also connected to a second input of the adding network via a third gate circuit to feed to the integrator simultaneously with the integration of a pulse a reset signal proportional to the steady voltage level corresponding to the integrated value of the preceding current pulse.
Inventors
- 👤 D Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:12
CPC Classifications
G; G11; G11C; G11C27/00; G11C27/02; G11C27/024; G11C27/026; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
392 words
Apparatus for converting a sequence of electrical current pulses into a sequence of steady voltage levels each of which has a magnituDe significant of the charge content of a respective current pulse, which apparatus includes: an integrator having an input to receive the current pulses, said integrator being operative to perform integration of each pulse over its duration and to deliver at an output thereof an integration output voltage; a first follow and hold circuit which has an input for receiving the output voltage of the integrator and an output for holding a steady voltage level corresponding to the output voltage of the integrator at the completion of the integration of a pulse; a normally open first gate circuit connected between the output of the integrator and the input of the first follow and hold circuit; a second follow and hold circuit which has an input for receiving the steady voltage level from the output of the first follow and hold circuit and which is operative to deliver the steady voltage corresponding to each current pulse until another voltage level corresponding to a succeeding current pulse is received from the first follow and hold circuit; a normally closed second gate circuit connected between the output of the first follow and hold circuit and the input of the second follow and hold circuit; a normally closed third gate circuit connected between the output of the first follow and hold circuit and the input of the integrator; and, a control pulse generator which is operative to deliver a control pulse to each of the gate circuits at the beginning of the integration of a current pulse to reverse the condition of each gate for the duration of the control pulse, thereby to close the first gate circuit to isolate the first follow and hold circuit from the integrator, to open the second gate circuit to feed the steady voltage level corresponding to a preceding current pulse from the first follow and hold circuit to the second follow and hold circuit, and to open the third gate circuit to feed the integrator with a reset signal proportional to the steady voltage level corresponding to the preceding current pulse so that the output voltage of the integrator at the completion of the integration of a current pulse is significant of the charge content of that pulse.
Claim 2
Dependent Claim
392 words
Apparatus for converting a sequence of electrical current pulses into a sequence of steady voltage levels each of which has a magnituDe significant of the charge content of a respective current pulse, which apparatus includes: an integrator having an input to receive the current pulses, said integrator being operative to perform integration of each pulse over its duration and to deliver at an output thereof an integration output voltage; a first follow and hold circuit which has an input for receiving the output voltage of the integrator and an output for holding a steady voltage level corresponding to the output voltage of the integrator at the completion of the integration of a pulse; a normally open first gate circuit connected between the output of the integrator and the input of the first follow and hold circuit; a second follow and hold circuit which has an input for receiving the steady voltage level from the output of the first follow and hold circuit and which is operative to deliver the steady voltage corresponding to each current pulse until another voltage level corresponding to a succeeding current pulse is received from the first follow and hold circuit; a normally closed second gate circuit connected between the output of the first follow and hold circuit and the input of the second follow and hold circuit; a normally closed third gate circuit connected between the output of the first follow and hold circuit and the input of the integrator; and, a control pulse generator which is operative to deliver a control pulse to each of the gate circuits at the beginning of the integration of a current pulse to reverse the condition of each gate for the duration of the control pulse, thereby to close the first gate circuit to isolate the first follow and hold circuit from the integrator, to open the second gate circuit to feed the steady voltage level corresponding to a preceding current pulse from the first follow and hold circuit to the second follow and hold circuit, and to open the third gate circuit to feed the integrator with a reset signal proportional to the steady voltage level corresponding to the preceding current pulse so that the output voltage of the integrator at the completion of the integration of a current pulse is significant of the charge content of that pulse.
Claim 3
Dependent Claim
37 words
Apparatus as claimed in claim 1, including an adding network having a first input to receive the current pulses, a second input to receive the reset signal and an output connected to the input of the integrator.
Claim 4
Dependent Claim
47 words
Apparatus as claimed in claim 1, including an output amplifier stage connected to the second follow and hold circuit and operative to amplify the voltage level delivered by the second follow and hold circuit and to buffer the final output from the second follow and hold circuit.
Claim 5
Dependent Claim
45 words
Apparatus as claimed in claim 2, for use with low level current pulses, which apparatus includes an input amplifier for receiving the current pulses and providing low drift current amplification thereof, such amplifier having its output connected to the first input of the adding network.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |